{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-48142", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "state": "PUBLISHED", "assignerShortName": "f5", "dateReserved": "2026-06-02T21:45:04.856Z", "datePublished": "2026-06-17T14:04:32.856Z", "dateUpdated": "2026-06-17T15:42:56.704Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "modules": ["ngx_http_charset_module"], "product": "NGINX Open Source", "vendor": "F5", "versions": [{"lessThan": "1.31.2", "status": "affected", "version": "1.13.10", "versionType": "custom"}, {"lessThan": "1.30.3", "status": "affected", "version": "1.30.0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "modules": ["ngx_http_charset_module"], "product": "NGINX Plus", "vendor": "F5", "versions": [{"lessThan": "37.0.2.1", "status": "affected", "version": "37.0", "versionType": "custom"}, {"lessThan": "R36 P6", "status": "affected", "version": "R36", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "\"F5 acknowledges p4p3r of CYBERONE and Han Yan of Xiaomi for bringing this issue to our attention and following the highest standards of coordinated disclosure.\""}], "datePublic": "2026-06-17T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">NGINX Plus and NGINX Open Source have a vulnerability in the </span><strong>ngx_http_charset_module</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;module. 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{}

{"bugzilla": {"description": "nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read", "id": "2489858", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2489858"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L", "status": "draft"}, "cwe": "CWE-125", "details": ["NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module\u00a0module. When content is served or proxied through a location block with both source_charset\u00a0utf-8; and a charset\u00a0directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their control) to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart. \nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "A flaw was found in NGINX. Remote, unauthenticated attackers can exploit a vulnerability in the `ngx_http_charset_module` when specific charset configurations are present. This can lead to a heap buffer over-read, potentially causing limited disclosure of memory or a denial of service by restarting the NGINX worker process."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid configuring NGINX with both `source_charset utf-8;` and an additional `charset` directive within the same location block in the `ngx_http_charset_module`. If these directives are not essential for your NGINX deployment, removing one or both will prevent the vulnerability from being exploited. After modifying the NGINX configuration, reload the NGINX service using `systemctl reload nginx`. This action may temporarily interrupt active connections."}, "name": "CVE-2026-48142", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nginx:1.24/nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "nginx:1.26/nginx", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "nginx", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-06-17T14:04:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-48142\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-48142\nhttps://my.f5.com/manage/s/article/K000161585"], "threat_severity": "Moderate"}

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